feat(resource-detector-azure): Add AKS Resource Detector

[JacksonWeber]

Short description of the changes

This pull request adds support for detecting Azure Kubernetes Service (AKS) environments in the @opentelemetry/resource-detector-azure package. It introduces a new resource detector for AKS clusters, enabling automatic extraction of cluster metadata such as cluster name and resource ID, and updates documentation and semantic conventions accordingly. The changes also include comprehensive tests for the new detector.

AKS Resource Detection:

• Added AzureAksDetector in src/detectors/AzureAksDetector.ts, which detects AKS cluster metadata from the environment or a mounted ConfigMap file, and exposes the attributes cloud.provider, cloud.platform, cloud.resource_id, and k8s.cluster.name.
• Exported the new azureAksDetector from src/detectors/index.ts and src/index.ts for public use. [1] [2]

Semantic Convention Updates:

• Added the experimental attribute k8s.cluster.name and enum value azure.aks for cloud.platform in src/semconv.ts. [1] [2]
• Defined constants and helper functions for AKS metadata extraction in src/types.ts, including parsing cluster name from ARM resource IDs.

Documentation and Testing:

• Updated README.md with AKS detector usage instructions, attribute descriptions, and configuration examples.
• Added unit tests for AKS detection logic in test/detectors/AzureAksDetector.test.ts, covering environment variable and file-based detection, and edge cases.